Frictional Force. The advantages and disadvantages
Subject : BASIC Science and Technology
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Topic : The Force Of Friction
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Class : Primary 6 / Basic 6
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Term :Third Term
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Week :Week 6
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Instructional Materials :
Online materials
Textbooks
Previous Knowledge :
The pupils have been taught meaning and types of forces
Behavioural Objectives :Â At the end of the lesson, the pupils should be able to
- Explain frictional Force
- Say the effects of the force of friction
- Explain the advantages and disadvantages of friction
- Mention diverse ways of reducing friction
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Content :
The force that opposes free movement on rough surface is known as the frictional forces
The force of friction opposes free movement
It is easily noticed in our day to day activities because friction enables movement. When you are pushed by your friend, you are able to stop because of the frictional force between the sole of your shoes and the rough surface of the ground
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Effects of FrictionÂ
- Friction enables movement
- It makes objects to stop
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It may lead to wear and tear
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The force of friction may produce undesirable heat
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It slows down the speed of moving objects
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Friction is needed to effect the acceleration of speed of moving objects
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Importance or Advantages of FrictionÂ
- The force of friction led to the discovery of fire when two rough surfaces of stones were strike together and a spark of fire was made
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Friction enable free movement and prevent us from skidding off the road
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The force of friction is applied on brakes of vehicles and this makes vehicles to stop and prevent unnessary accident
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The grinding stone used by our parents in the olden days was made possible by the force of friction
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The rough surfaces of stones were used to sharpen the edges of knives in the olden days. It is an advantage of friction
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Disadvantages or Demerits of FrictionÂ
- It may lead to undesired and unwanted heat
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Severe unchecked, unwanted and unwanted heat may lead to unwanted fire outbreak
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Most vehicles are burnt up on third mainland bridge during terrible and pathetic traffic gridlock becomes most of these vehicles develop over heating which lead to fire outbreak
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Friction leads to wear and tear of most parts of machines or vehicles. This wear and tear is easily noticed on the sole of our shoes that we have been using for some times
Various or Diverse Ways of Reducing FrictionsÂ
We can reduce friction in the following ways
- By applying lubricant
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By applying grease
3. By making use of gear, ball or sockets
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Presentation
The topic is presented step by step
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Step 1: The class teacher revises the previous topics
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Step 2. He introduces the new topic
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Step 3: The class teacher allows the pupils to give their own examples and he corrects them when needs arise
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Class Activities
Tell the pupils to rub their two hands together and tell them to tell you what they observe
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Evaluation :
- What is friction
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Mention two advantages of frictional Force
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Mention three disadvantages of friction
4. Mention two effects of frictional Force
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Conclusion :
He gives a brief note on the topic and he goes round to mark
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Assignment :
Read about the force of gravity
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